<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <link rel="stylesheet" href="./css/inputnumber.css"/>
    <link rel="stylesheet" href="./css/index.css"/>
    <title>购物车</title>
</head>
<body>
    <div class="app-container" id="app">
        <!-- 顶部banner -->
        <div class="banner-box"><img src="./img/fruit.jpg" alt=""/></div>
        <!-- 面包屑 -->
        <div class="breadcrumb">
            <span>🏠</span>
            /
            <span>购物车</span>
        </div>
        <!-- 购物车主体 -->
        <div class="main" v-if="fruitList.length > 0">
            <div class="table">
                <!-- 头部 -->
                <div class="thead">
                    <div class="tr">
                        <div class="th">选中</div>
                        <div class="th th-pic">图片</div>
                        <div class="th">单价</div>
                        <div class="th num-th">个数</div>
                        <div class="th">小计</div>
                        <div class="th">操作</div>
                    </div>
                </div>
                <!-- 身体 -->
                <div class="tbody">
                    <div class="tr" v-for="item in fruitList" :key="item.id" :class="{ active: item.isChecked }">
                        <div class="td"><input type="checkbox" v-model="item.isChecked"/></div>
                        <div class="td"><img :src="item.icon" alt=""/></div>
                        <div class="td">￥{{ item.price }}</div>
                        <div class="td">
                            <div class="my-input-number">
                                <button class="decrease" :disabled="item.num <= 1" @click="item.num--"> -
                                </button>
                                <span class="my-input__inner">{{ item.num }}</span>
                                <button class="increase" @click="item.num++"> +</button>
                            </div>
                        </div>
                        <div class="td">￥{{ (item.price * item.num).toFixed(2) }}</div>
                        <div class="td">
                            <button @click="del(item.id)">删除</button>
                        </div>
                    </div>
                </div>
            </div>
            <!-- 底部 -->
            <div class="bottom">
                <!-- 全选 -->
                <label class="check-all">
                    <input type="checkbox" v-model="checkAll"/>
                    全选
                </label>
                <div class="right-box">
                    <!-- 所有商品总价 -->
                    <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{
                            totalPrice
                        }}</span></span>
                    <!-- 结算按钮 -->
                    <button class="pay">结算( {{ totalCount }} )</button>
                </div>
            </div>
        </div>
        <!-- 空车 -->
        <div class="empty" v-else>🛒空空如也</div>
    </div>
    <script src="../utils/vue.js"></script>
    <script>
        // 默认初始数据
        const defaultData = [
            {
                id: 1,
                icon: './img/火龙果.png',
                isChecked: true,
                num: 2,
                price: 6,
            },
            {
                id: 2,
                icon: './img/荔枝.png',
                isChecked: false,
                num: 7,
                price: 20,
            },
            {
                id: 3,
                icon: './img/榴莲.png',
                isChecked: false,
                num: 3,
                price: 40,
            },
            {
                id: 4,
                icon: './img/鸭梨.png',
                isChecked: true,
                num: 10,
                price: 3,
            },
            {
                id: 5,
                icon: './img/樱桃.png',
                isChecked: false,
                num: 20,
                price: 34,
            },
        ]
        const app = new Vue({
            el: '#app',
            data: {
                // 水果列表
                fruitList: JSON.parse(localStorage.getItem('fruitList')) || defaultData
            },
            methods: {
                del(id) {
                    this.fruitList = this.fruitList.filter(item => item.id !== id)
                }
            },
            computed: {
                // 总价
                totalPrice() {
                    return this.fruitList.filter(item => item.isChecked).reduce((sum, item) => sum + item.num * item.price, 0).toFixed(2)
                },
                // 总数量
                totalCount() {
                    return this.fruitList.filter(item => item.isChecked).reduce((sum, item) => sum + item.num, 0)
                },
                // 全选
                checkAll: {
                    // 根据小复选框确定全选框状态
                    get() {
                        return this.fruitList.every(item => item.isChecked)
                    },
                    // 根据全选框设置小复选框
                    set(value) {
                        this.fruitList.forEach(item => item.isChecked = value)
                    }
                }
            },
            watch: {
                fruitList: {
                    deep: true,
                    handler(value) {
                        localStorage.setItem('fruitList', JSON.stringify(value))
                    }
                }
            }
        })
    </script>
</body>
</html>
